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entre STATES, PATENT Friet'.

PETER J. HAMLER, DECEASED,

LATE 0F CHCAGO, ILLINOIS, BY JEROME I?. I-IAll'EL-ER,

0F CHCAG'O, ILLINOIS, ASSIGN'EE.

FERTILIZER DRIER.

Specification of Ressued Letters Patent. gigsued 23 1922,

Original No. 1,321,628, dated November' l1, 19119, Serial No. 300,353, filed May 28, 1919-. Application fer reissue led February 14.-,

T0 all whom '25' may conce-rn:

Be it known that PETER J HAMLER, deceased, late a citizen ot the United States, residing at Chicago, in the county of Coolr and State of Illinois, has invented a new and useful Fertilizer Drier, of which the following is a specication.

This invention relates to certain imp-rovements in machines or apparatuses used for drying fertilizer in preparation for its commercial use.

Ads commonly constructed at the present time, such driers embodyI an inner and an outer inclosing drum or cylinder' of steel, these two drums or cylinders being pern fectly plain, spaced apart to form a steam space, whereby the inner drum is heated, provided with suitable feed and discharge openings, and an axially positioned agitatorshaft 'carrying radiating agitator-arms.,

Vhile the drier thus described is, to a certain extent, practical for the purpose intended,yet there are many. serious objections. Some of such objections are its eX- pensive construction, owing to the fact that it necessarily includes hundreds of stay'- bolts and rivets; the necessity ,of employing comparatively heavyl gage metal in order to providea reasonable foundation for the stay-boltsg the fact that saidstay-bolts and rivets become loosened by the contraction and expansion of the metal, thereby Vcausing the drums or cylinders t0' leak; and, finally, by reason of the heads of the stay-bolts being located at the inner side of the inner drurn or cylinder, such forni obstructions upon wlliich the material being oper-ated upon finds ready lodginent and 'furthermore necessitates an undue and an undesirable short- 'ening of the agitator-arms in order, that they may escape or clear the headset the rivets and stay-bolts, thus permitting of this lodg- Inent of materialbein' still further augmented -to the extent o forming an insulation around the interior surface of the drum, greatly to the detriment of its heating ability, whereby the eficiencyof. the apparatus becomes reduced.

The' principal objects ot this inyention are, therefore, to overcome the objections stated, by reducing very materially the cost of manufacture by reason of an entire omission of the now commonly employed hun- 1921. Serial No. 444,880'ef.

dreds of stay-bolts and rivets; to provide a smooth inner snr'lace for the inner drum or cylinder, thus permitting the agitator-arms to travel close thereto and'p-revent the accumulationor deposit ot'niaterial upon said surface, thereby increasing Vthe heating ettig ciency of the apparatusyto provide an increased heating--surface for the inner cylinder; to provide or'the expansion and contraction of the' metal; and, finally, by the omission of'said stay-bolts and rivets to permit of the use of lighter gage metal in the construction o1- the cylinders.

And the invention consists in certain ifeatures of construction hereinafter referred to and more particularly pointed out in the claims.

Referring to the drawing, in 'which illustrated this invention in side elevation and partial section, l designates tbeoute'r drum or cylinder, within which is inclosed the inner drum or cylinder 2;, the latter being of less diameter than the outer drum and combining therewith to form an intermediate annular steam-space 3. Steam'under pressure is admitted to the steam-space by means oi inlet-pipes t located near the opposite ends of the apparatus andleading trom any suitable source of steam-supply. 'At'op posite sides the apparatusfis provided-with exhaust-pipes 5, which may return tofth'e steam-supply orelsew'here. r

Spacing-:rings 6 may be located at the opposite ends of the apparatus between the two drums or cylinders, rivets' 7 being employed te connect the drums or cylinders and the rings. i

The outer drum is avplain cylinder, here totore, but the inner drum or cylinder is annularly corrugated, preferablyl 'as shown, though other forms of corrugations capable of performing the 'functions and rendering the advantages attained `thereby may be 'sub stituted. As will beobvious, by thusfcorrugating the innerdrum or cylinder, the same is rendered stronger and better Capable' .of withstanding the steamfpressu're alsoit provides a much greater heating-surface; provides for expansion and contraction, and, being stronger, may be formed of lighter material and without stay-bolts and rivets, whereby the cost is materially reduced. And, furthermore, the inner surface of the is enabled, ractically, to still further and to about doub e the extent of the life of the apparatus by turning the same only one fourth of a revolution, this by reason of the fact that so much of the bottom surface of the inner cylinder does not become impaired as heretofore because of the fact that it is i kept clear of depositsy of matter to a far eater extent, as heretofore explained, and or the further reason that there is an utter absence of rivets that vbecome loosened and their efficiency impaired by reason of such excess de osits of material.

The fo lowing is claimed:

l. In an apparatus of the class described, the combination with an outer cylinder, an inner inclosed annularly corrugated cylinder, and an intermediate spacing-ring at each end of said cylinder, of opposite heads 'bolted to the outer faces provided with bearings, an agitator-shaft mounted for rotation in the bearings, agitator-arms radiating from the shaft, and blades carried by said arms and having their outer edges curved to conform to the corrugations of the inner cylinder and positioned in close proximity therewith.

2. In a machine of the class described, the combination with inner and outer spaced apart cylinders, heads for the cylinders', one of which heads is provided with an opening in its upper side, of a chamber located at one end of the machine, a pipe connecting the lower end of the same with the opening in the head, a foraminous diaphragm subdividing the chamber and an exhaust pi e leading from the chamber above the diaphraofm.

3. In an apparatus of the class described, the combination of an outer cylinder, aninof the rings and ner inclosed annularly corrugated cylinder.

of adequate strength and rigidity to withstand distortional strains without intermediate reinforcement, and connecting means at the ends of the cylinders for securing and maintaining said cylinders in spaced relation to one another, the inner cylinder being imperforate throughout its length intermediate the end connecting means, and opposite heads secured to the structure and provided with centrally disposed bearings, an agitator shaft mounted for rotation in the bearings, a itator arms radiating from the shaft, and bades carried b said arms and having their outer edges configured to closely conform to the corrugations of the inner cylinder and `of adequate strength positionedin close proximity therewith, substantially as described.

4. In'an apparatus of the class described, the combination of an outer cylinder, an inner inclosed annularly corrugated cylinder of adequate strength and rigidity to withstand distortional strains without intermediate reinforcement, connecting means at the ends of the cylinders for securing and maintaining said cylinders in spaced relation. to one another, the inner cylinder being imperforate throughout its length intermediate the end connecting means and agitating means within the inner cylinder, provided with blades having their outer edges configured to closely conform to the corrugations of the inner cylinder and positioned in close proximity thereto, substantially as described.

5. In an apparatus of the class described, the combination of an outer cylinder, an inner inclosed annularly corrugated cylinder of adequate strength and rigidity to with stand distortional strains without intermediate reinforcement, connecting means at the ends of the cylinders for securing and maintaining said cylinders in spaced relation to one another, the inner cylinder being im# perforate throughout its length intermediate the end connecting means and rotatable agitating means within the cylinder, said agitating means being extended to points closelycontiguous to the surface of the inner cylinder, and having'an end contour conformable to the corrugations of the inner cylinder, substantially as described.

In an apparatus of the class described, the combination of an outer cylinder, an inner inclosed annularly corrugated cylinder and rigidity to withstand distortional strains without intermediate reinforcement, connecting means at the ends of the cylinders for securing and maintaining said cylinders in spaced relation to one another, and agitating means Within the cylinder, said agitating means being extended to points closely contiguous to the surface of the inner cylinder, and having an end contour conformable to the corrugations of the inner cylinder, and means for securing relative rotation between the cylinders and agitating means, substantially as described.

JEROME P. HAMLER,

Assignee. 

